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The Earth's core.
The Earth's core.
The Earth's core.
The Earth's core.
Convention? You mean convection! The mantle is not solid but molten, although extremely viscous, and heated by radio-active decay. Since the only escape for the heat is conduction through the crust and in lava, the consequent temperature gradients create convection currents.
Not only air temperature, but also barometric pressure differences contribute.
Since the man o' war has no means of propulsion, it is moved by a combination of winds, currents, and tides. Although it can be found anywhere in the open ocean
Fish don't hibernate. They have to stay active to breathe, unless there are strong enough currents to maintain the flow of water through their gills.
The Hawaiian islands are made from volcanic eruptions. The active volcanoes in the circle of fire are to the south of Hawaii.
a) Exogenous b) Earthquakes c) Mountain Building d) Endogeney e) Tsunami Answer you seek is: Exogenous.
No. During the night time, you cannot see anything clear in the ocean regardless how good your vision you have. Sharks can be very active during the night time in the ocean and they will feed on anything that they see at night time. Currents can also drive you off far into the sea and you may find yourself lost near the middle of the ocean depending on how strong and big the currents are. At night, you also cannot see the coast boundaries, and you can swim in the wrong direction out into sea. Even the strongest swimmers are afraid to swim in the ocean at night time because of the powerful currents. It is basically like common sense.
The principle of the DFIG is that rotor windings are connected to the grid via slip rings and back-to-back voltage source converter that controls both the rotor and the grid currents. Thus rotor frequency can freely differ from the grid frequency (50 or 60 Hz). By using the converter to control the rotor currents, it is possible to adjust the active and reactive power fed to the grid from the stator independently of the generator's turning speed.